
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.ServletResponse;

public class ServletFiltro implements Filter {

    public void init(FilterConfig filterConfig) throws ServletException {
    }

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpSession session = ((HttpServletRequest) request).getSession();
        String isLogging = (String) session.getAttribute("isLogging");

        if (isLogging == null) {
            session.setAttribute("erroLogin", "Informe o login e a senha novamente!");
            ((HttpServletResponse) response).sendRedirect("../index.jsp");
        } else {
            chain.doFilter(request, response);
        }
    }

    public void destroy() {
    }
}
